2results about How to "Reduce uneven deformation" patented technology

The application discloses a high-strength hot-rolled rail low-residual stress straightening method and belongs to the technical field of rail production processes. The method realizes effective reduction of the bending degree of the rail before straightening and precise control of uneven deformation in the straightening process by implementing the precise reverse pre-bending process on the rail cooling stage, cooperating with the optimized straightening machine horizontal roll reduction parameters and the straightening speed control, finally controls the rail bottom residual stress of the 60kg / m (60, 60N) high-strength hot-rolled rail below 250MPa, and reduces 37-46MPa compared with the traditional process, significantly improves the rail straightness and use safety, and enhances the product market competitiveness.

This invention discloses a double-walled small bend tube and a recirculation combustion chamber, comprising an inner wall and an outer wall spaced apart. One end of the inner wall near the flame tube is connected to the other end of the outer wall near the flame tube. The inner and outer walls form a cavity for forming a cooling gas film. The outer wall has n rows of impact cooling holes for introducing cooling gas into the cavity. Each row of impact cooling holes is evenly distributed along the circumferential direction of the outer wall and has the same diameter. The diameter of the n rows of impact cooling holes increases gradually from the end of the outer wall near the flame tube to the end away from the flame tube, so that the flow rate of cooling gas impacting the inner wall increases gradually with the distance from the flame tube. This can effectively reduce the highest wall surface temperature at the end of the inner wall, reduce the ablation and uneven deformation of the double-walled small bend tube, extend its service life, and effectively solve the air leakage problem between the small bend tube and the casing under different vibrations and thermal expansion deformation, ensuring a seal.